Difference between case object and object

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Here’s one difference – case objects extend the Serializable trait, so they can be serialized. Regular objects cannot by default:

scala> object A
defined module A

scala> case object B
defined module B

scala> import java.io._
import java.io._    

scala> val bos = new ByteArrayOutputStream                                            
bos: java.io.ByteArrayOutputStream =  

scala> val oos = new ObjectOutputStream(bos)                                          
oos: java.io.ObjectOutputStream = java.io.ObjectOutputStream@e7da60                   

scala> oos.writeObject(B)

scala> oos.writeObject(A)
java.io.NotSerializableException: A$

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